Use a soft specification welding parameters improve the quality of tungsten electrode welding

Soft specification refers to a small welding current, welding slower specification parameters. Austenitic stainless steel, martensitic stainless steel, nickel-based heat-resistant alloy material at the same thickness welding specification parameters used in the engine bay compared with our common parameters, 1 to 2 times the current small, low welding speed 2 ~ 3 times. According to trial experience, we feel that the advantages of soft specification are:

(1) weld appearance and good cross-sectional shape.

Because the molten metal flow and solidification process has a time, particularly on the use of metal to achieve thermal conductivity to be welded at the entire section is heated and melted tungsten electrode welding method is especially so. The above process have a direct impact weld forming another special adapter is sleek and the base metal. The soft specification parameters coupled with the groove width larger weld plate, it will be conducive to fully carry out these processes, which can give a smooth surface and a smooth transfer base material, and the positive and negative close to the weld width.

(2) in favor of the weld puddle and protection.

Due to the large welding speed, argon drift back large bath difficult to get good gas protection weld oxidation. After the oxidation of the metal flow deteriorated, affecting the weld, defects. Soft specifications for low welding speed of this malady can be avoided to improve the protective effect of the gas and weld quality.

(3) welding defects can be reduced.

Welding speed, heat input to reduce the crystallization rate of the weld metal to accelerate, the impact of gas escape, prone to porosity. Welding speed too fast is also prone to undercut. Soft specification can reduce the production of the above-mentioned defects.

(4) easy operation easy to observe, will help to ensure the quality of welding.